[Radiance-general] Missing solar source visibility from gendaylit for multiple ambient-bounces

[Germán Molina Larrain]

I have a question related to this.

Does the PS affect numerical results? or it is just a matter of
"aesthetics" in the picture?

2015-06-02 21:22 GMT-03:00 J. Alstan Jakubiec <alstan at jakubiec.net>:

>  Hi Greg -- thanks for the reply. Indeed setting -ps 1 fixes the issue. At
> this resolution, the solar disc is actually ~5 x 5 pixels, so it must have
> been a very near miss with the default of -ps 4.
>
> Best,
> Alstan
>
>
> On 6/2/2015 12:25 AM, Greg Ward wrote:
>
> It's probably just being missed during the initial sampling, which is
> random.  Try setting "-ps 1" on the command line, or use "set ps 1" within
> rvu.
>
>  Cheers,
> -Greg
>
>  *From: *"J. Alstan Jakubiec" <alstan at jakubiec.net>
>
> *Subject: *Re: [Radiance-general] Missing solar source visibility from
> gendaylit for multiple ambient-bounces
>
> *Date: *June 1, 2015 6:53:24 AM PDT
>
>
>   To reply to my own post, I had another generic office model sitting
> around, so I applied the same materials, same sky model and same rendering
> parameters, but the solar disc showed up this time. So perhaps it had
> something to do with how obj2rad was constructing the surfaces? *Shrugs*
>
> Alstan
>
> On 6/1/2015 11:54 AM, J. Alstan Jakubiec wrote:
>
> Dear List,
>
> I'm running into a bit of a frustrating issue, and I am not sure what the
> cause might be. I am creating a sky model using gendaylit with a high
> amount of direct solar component as seen below,
> > gendaylit 05 18 8.667 -W 881 63 -a 1 -o -104 -m -120
>
> The issue is that when I render my scene using -ab 1, I can see the solar
> disc. When I render it with a higher number of ambient bounces, such as 4,
> the solar disc is absent from the final visualization. You can see the
> results here: 1 ambient bounce
> <https://dl.dropboxusercontent.com/u/3175325/ab1.png>, 4 ambient bounces
> <https://dl.dropboxusercontent.com/u/3175325/ab4.png>. You will notice
> that in the rendering with 4 ambient bounces, the shadows are still cast
> properly as if the sun is present.
> I am using a slightly older version of Radiance right now (RADIANCE 4.2a
> lastmod  by  on w015t-001), but I suspect that isn't the root of the
> problem. This issue also occurs when I use gensky
> <https://dl.dropboxusercontent.com/u/3175325/ab4_clsky.png>. I have never
> seen this kind of behavior before from Radiance. Does anyone have thoughts
> as to what might cause this?
>
> Thank you,
> Alstan
>
>
>
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